Receiver and method for WLAN burst type signals

Abstract

The present invention relates to methods and devices for receiving signals in a Wireless Local Area Network (wireless LAN, or WLAN), particularly in the case that the signals are Orthogonal Frequency Division Multiplexed (OFDM) signals. A frequency tracking apparatus for an OFDM receiver is disclsoed having means for determining the correlation of corresponding samples of two received pilot carrier symbols, one said sample delayed a predetermined duration with respect to the other; means for integrating said correlation over an integration window and means for determining a frequency tracking error from the sum of said integration.

1 . A frequency tracking apparatus for an OFDM receiver having: 
 means for determining the correlation of corresponding samples of two received pilot carrier symbols, one said sample delayed a predetermined duration with respect to the other;    means for integrating said correlation over an integration window; and    means for determining a frequency tracking error from the sum of said integration.    
     
     
         2 . An apparatus according to  claim 1  further comprising correlation determining means and integration means for symbols from a number of other pilot carriers; said frequency tracking error being determined from the average integration sum of said pilot carriers.  
     
     
         3 . A method of frequency tracking in an OFDM receiver, the method comprising: 
 determining the correlation of corresponding samples of two received pilot carrier symbols, one said sample delayed a predetermined duration with respect to the other;    integrating said correlation over an integration window; and    determining a frequency tracking error from the sum of said integration.